Enichem Tecnoresine S.p.a.

Enichem Technoresine S.p.a.

Alberto Petri

Corrado Berti

Francesco Pilati

Piero Manaresi

Sergio Poggio

Flame-resistant thermoplastic branched polycarbonates of high molecular weight are prepared from:

Flame-resistant polycarbonate containing units from halogenated

Thermoplastic, branched, high-molecular-weight polycarbonates endowed with flame-proof properties (self-extinguishing properties) are characterized in that they contain in their macromolecule carbonate units, units deriving from a di-hydroxy-aromatic compound having the formula: ##STR1## wherein: R is a single bond; or

Flame-proof polycarbonate containing units deriving from halogenated

Flame-resistant polycarbonates containing units deriving from

Thermoplastic branched polycarbonates of high molecular weight and which possess flame-resistant (self-extinguishing) properties are provided wherein said polycarbonates contain in addition to carbonate units, units derived from a dihydroxyaromatic compound, units derived from a halogenated triphenyl compound and units derived from a polyfunctional organic branching agent.

Flame-proof polycarbonates containing units deriving from halogenated

Branched, thermoplastic polycarbonates, suitable for being processed according to the blow-molding technique, are prepared by copolymerization with hydroxy-naphthoic acids or their derivatives.

Branched polycarbonate from hydroxy-naphthoic acid or derivative, and

Branched, thermoplastic polycarbonates, suitable for being processed according to the blow-molding technique, are prepared by copolymerization with tri- or tetra-hydroxy biphenyl compounds.

Branched polycarbonate from tri- or tetra-hydroxy biphenyl compounds

Thermoplastic, branched, high-molecular weight polycarbonates endowed with properties of flame-resistance (self-extinguishing polycarbonates) are characterized by the presence in their polymeric chain of units deriving from a di-hydroxy-aromatic compound having the formula: ##STR1## wherein: R is a single bond; or is a substituted or non-substituted, linear or branched alkyl group containing from 1 to 5 carbon atoms; or is a group selected from O, S, SO.sub.2, CO;

Flame-resistant polycarbonates, containing in their polymeric chain

Branched, soluble, high-molecular-weight, thermoplastic polycarbonates having improved properties, and, in particular, suitable to the fabrication by blow-moulding, characterized by the presence in their structure of units deriving from the use in the synthesis of tris(4'-hydroxyaryl)-amino-S-triazines having the formula: ##STR1## wherein R.sub.1 and R.sub.2, equal to, or different from each other, indicate hydrogen, linear or branched C.sub.1-5 alkyl, or halogen (in particular, chlorine and bromine).

Branched polycarbonate from 2,4,6-tris(4'-hydroxyaryl)-amino-S-triazine

Branched, thermoplastic polycarbonates, suitable for being processed by means of the blow-moulding technique, are prepared by means of copolymerization with aliphatic polyfunctional acids or their derivatives.

Branched polycarbonate from aliphatic polyicarboxylic acids or

In the present invention disclosed are high-molecular-weight, soluble, thermoplastic branched polycarbonates endowed with improved properties, and suitable to blow-moulding fabrication. Such polycarbonates are characterized by the presence, in their structure, of units deriving from the following double-ring aromatic compounds: ##STR1## wherein R.sub.1 indicates H, --COCL, --SO.sub.2 Cl; R.sub.2, R.sub.3 and R.sub.4, equal to or different from each other, indicate --COCl or SO.sub.2 Cl. The above-said compounds are directly used in the syntheses.

Polycarbonate branched with double-ring aromatic compound

Branched, thermoplastic polycarbonates, suitable for being processed by means of the blow-moulding technique, are prepared by means of copolymerization with tetrafunctional heterocyclic compounds.

Branched polycarbonates containing tetracarboxyfunctional heterocyclic

In the present invention disclosed are high-molecular-weight, soluble, thermoplastic branched polycarbonates endowed with improved properties, and suitable to blow-moulding fabrication. Such polycarbonates are characterized by the presence, in their structure, of units deriving from the following single-ring aromatic compounds: ##STR1## wherein R.sub.1 indicates H, --COCl, --SO.sub.2 Cl; R.sub.2, and R.sub.3, equal to or different from each other, indicate --COCl or SO.sub.2 Cl. The above-said compounds are directly used in the syntheses.

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Milan, Italy

Alberto Petri